Unity教程之-对UGUI长按事件的实现

在使用UGUI过程中，有时我们想长按钮按，执行某个功能，但UGUI只有简单的单击功能，下面我们来看下UGUI长按事件的实现，贴上代码

using UnityEngine;
using System.Collections;
using UnityEngine.Events;
using UnityEngine.EventSystems;
using UnityEngine.UI;

[AddComponentMenu(“UI/LongPressButton”)]public class UILongPressButton : Selectable, IPointerDownHandler,IPointerExitHandler,IPointerUpHandler
{
[SerializeField]UnityEvent m_onLongPress = new UnityEvent();

float interval = 0.1f;
float longPressDelay = 0.5f;

private bool isTouchDown = false;
private bool isLongpress = false;
private float touchBegin = 0;
private float lastInvokeTime = 0;

// Update is called once per frame
void Update ()
{
if (isTouchDown && IsPressed() && interactable)
{
if (isLongpress)
{
if (Time.time – lastInvokeTime > interval)
{
m_onLongPress.Invoke();
lastInvokeTime = Time.time;
}
}
else
{
isLongpress = Time.time – touchBegin > longPressDelay;
}
}
}

public void OnPointerDown(PointerEventData eventData)
{
base.OnPointerDown(eventData);
touchBegin = Time.time;
isTouchDown = true;
}

public void OnPointerExit(PointerEventData eventData)
{
base.OnPointerExit(eventData);
isTouchDown = false;
isLongpress = false;
}

public void OnPointerUp(PointerEventData eventData)
{
base.OnPointerUp(eventData);
isTouchDown = false;
isLongpress = false;
}
}

好了，本篇unity3d教程到此结束，下篇我们再会！